Welcome ladies and gentlemen, and thank you for your patience. You've joined Xunlei's Fourth Quarter and Fiscal Year 2021 Earnings Conference Call. At this time, all participants are in the listen only mode. Please be advised that today's conference is being recorded. I would now like to turn the call over to your host, Investor Relations Manager, Ms. Luhan Tang.
Thank you. Thank you, everyone, and good day, everyone, and thank you for joining Xunlei's Fourth Quarter and Fiscal Year 2021 Earnings Conference Call. As of now, our earnings release is available on our IR website, which is intended to supplement our prepared remarks during today's call. On the call with me today are Eric Zhou, Chief Financial Officer, and Li Li, Senior Vice President of Finance. For today's agenda, I will first read a prepared remarks by our Chairman and CEO, Mr. Jinbo Li, on the highlight of our fourth quarter operations and strategies for 2022. Then Mr. Eric Zhou, our CFO, will walk you through the details on the financial results and wrap up with our guidance for the first quarter of 2022. We'd like to welcome any questions from you after the management's remarks.
Before we get started, I would like to take this opportunity to remind you that the discussion today will contain certain forward-looking statements made under the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. Such statements are based on management's current expectations under current market conditions and are subject to risks and uncertainties that are difficult to predict, which may cause actual results to differ materially from those made in the forward-looking statements. Please refer to our SEC filings for a more detailed description of the risk factors that may affect our results. Xunlei assumes no obligation to update any forward-looking statements, except as required under applicable laws. On this call, we will be using both GAAP and non-GAAP financial measures. A consolidation of non-GAAP to comparable GAAP measures can be found in our earnings press release.
Please note that all numbers are in US dollars, unless otherwise stated. Now, the following is the prepared statement by Mr. Jinbo Li, Chairman and CEO of Xunlei Limited. Thank you for joining us today. In 2021, we made some important progress in our major business segments. Our total revenue grew 28.3% to $239.6 million, and achieved a net profit of approximately $1.1 million, a dramatic improvement over a net loss of $14.1 million in 2020. Even though we coped with challenges due to the COVID-19 and the involved, evolving governmental regulations that affected our operating environment, we were able to conduct our business effectively and markedly improved our performance as compared with last year.
I'd like to take this opportunity to thank our employees for their diligence and dedication to serve our customers during a trying period of time. Because of their agility, resilience, and dedication, we are able to start fiscal year 2022 with a solid foundation. In particular, I'd like to express my gratitude to the team responsible for our membership subscription business, which generated significant cash flows to fund our innovative, innovation efforts. I'm also appreciative and proud of the outstanding performance our cloud computing colleagues achieved during 2021. Lastly, I'd like to thank the employees in our corporate development and innovation department for their outstanding efforts that created new growth opportunities that are expected to produce potentially exciting results in the days to come.
Back to our fourth quarter of 2021, the total revenues for the fourth quarter reached $71.1 million, an increase of 18.6% from previous quarter, exceeding the revenue guidance we provided in the third quarter. The performance was driven primarily by the sequential growth of our cloud computing products and other internet value-added services. Now I'd like to provide some details on the operating results. Starting with our largest revenue growth driver, cloud computing and other internet value-added services contributed $4.7 million in revenue, which accounted for approximately 62.9% of total revenue, representing 26.9% quarter-over-quarter growth in the fourth quarter. Cloud computing revenue alone reached $28.2 million, representing a 12.8% quarter-over-quarter increase, driven by increased customer demand and bandwidth capacity expansion.
Xunlei has a unique competitive edge in its shared cloud computing business, which enjoyed uninterrupted growth for a number of years, and the growth was driven by rising demand for the bandwidth for short video clips and live streaming products. We're optimistic that high demand for live streaming products may persist into 2022. In the second half of 2021, we began to explore new markets for our live streaming services. We are pleased to see our efforts begin to yield encouraging results. For the fourth quarter of 2021, revenue from our other Internet Value-Added Services, which mainly consists of live streaming services, reached $16.4 million, and grew 61.6% as compared with the third quarter of 2021. We expect the growth momentum will continue into 2022. Now, turning to our subscription business.
Membership subscription contributed $23.7 million in revenue, accounting for approximately 33.3% of total revenue. Subscription revenue grew 4.3% from the previous quarter. The increase was mainly due to the newly added cloud storage function, which helped user retention as well as year-end marketing activities. At the end of the fourth quarter of 2021, the number of subscribers reached 4.39 million, and was up approximately 5.8% as compared with that at the end of the third quarter. Further, it's encouraging that our premium membership subscription continues to gain popularity. Now, turning to our online advertising. Even though the online advertising went through a challenging time due to competition and evolving governmental regulations, we still saw a 33.1% sequential growth in revenue last quarter.
This was partially attributable to our efforts to enrich user experiences and improve operations, and partly to a recovery from an especially hard-hit third quarter. Going forward, we'll continue to follow regulations on internet advertising and try to mitigate their impact by delivering more user-friendly features and increasing customer loyalty. Before I conclude my remarks, I'd like to say that despite the ups and downs of the capital market, we intend to remain focused and do what we are good at, and I trust our efforts will be rewarded. With that, I will hand the call over to Mr. Eric Zhou, our Chief Financial Officer. Eric will cover our financial results in detail and share our outlook.
Thank you Luhan and hello everyone and thank you again for joining Q4 and full year 2021 earnings conference call. I will now go through the details of our financial results and wrap up with our revenue guidance for the first quarter of 2022. For the fourth quarter of 2021, total revenues were $71.1 million, representing an increase of 18.6% from the previous quarter. The increase in total revenues was mainly attributable to increased revenue from cloud computing and other IVS business. Revenues from cloud computing and other IVS were $44.7 million, representing an increase of 26.9% from the previous quarter. The cloud computing revenues was $28.2 million, representing a 12.8% sequential increase.
The live streaming revenue was $14.5 million compared with $8.35 million in the previous quarter. The increase of cloud computing and other IVS revenues was mainly driven by increased demand for cloud computing and new live streaming products we launched in the second half of 2021. Revenues from subscription were $23.7 million, an increase of 4.3% from the previous quarter. The number of subscribers was 4.39 million as of December 31st, 2021 compared with 4.15 million as of September 30th, 2021. The average revenue per subscriber for the fourth quarter of 2021 was RMB 34.3 compared with RMB 35.4 for the previous quarter.
Revenues from online advertising were $2.8 million, representing an increase of 33.1% from the previous quarter. The increase of online advertising revenues was largely due to business recovery and our marketing efforts during the fourth quarter. Cost of revenues was $37.6 million, representing 52.8% of our total revenues, compared with $30.4 million or 50.7% of the total revenues in the previous quarter. The increased cost of revenues was mainly attributable to increased sales of our cloud computing and other IVS services. Bandwidth costs, as included in cost of revenues, were $22.8 million, representing 32.1% of our total revenues, compared with $21.7 million or 36.2% of the total revenues in the previous quarter.
The increased bandwidth costs were mainly due to increased demand for our cloud computing products, which were consistent with the increased cloud computing revenue. The remaining cost of revenues mainly consisted of costs related to the revenue sharing costs for our live streaming products and the depreciation of servers and other equipment. Gross profit for the fourth quarter was $33.3 million, representing an increase of 13.3% from the previous quarter. Gross margin was 46.7% in the fourth quarter, compared with 48.9% in the previous quarter. The increase in gross profit was mainly due to increased cloud computing and other IVAS revenues.
The decrease in gross margin was mainly due to decreased portion of subscription revenues to total revenues, which has a high gross margin and increased portion of live streaming revenues to total revenues, which has a lower gross margin. Research and development expenses for the fourth quarter were $16.6 million, representing 23.3% of our total revenues, compared with $16.8 million or 28% of our total revenues in the previous quarter. Sales and marketing expenses for the fourth quarter were $6.6 million, representing 9.3% of our total revenues, compared with $6.8 million or 11.3% of our total revenues in the previous quarter.
General and administrative expenses for the fourth quarter were $11.1 million, representing 15.6% of our total revenues, compared with $11.4 million or 19% of our total revenues in the previous quarter. The decrease was primarily due to the decreased legal and consulting expenses. Operating loss was $1.7 million, compared with an operating loss of $5.7 million in the previous quarter. The decrease in operating loss was primarily due to increased gross profit, as discussed above. Other income was $1 million, compared with other income of $500,000 In the previous quarter. Net loss was $500,000 compared with a net loss of $5.1 million in the previous quarter.
Non-GAAP net income was $1.7 million in the fourth quarter of 2021, compared with a net loss of $3.1 million in the previous quarter. The decreased net loss and increased non-GAAP net income were primarily due to increase in revenues of each business line and improved gross profit, as discussed above. Our diluted loss per ADS in the fourth quarter of 2021 was approximately $0.01, as compared with a loss of $0.08 in the third quarter of 2021. As of December 31st, 2021, the company had cash equivalents and short-term investments of $239 million, compared with $228.3 million as of September 30th, 2021. Now I'd like to walk you through the financial results of fiscal year 2021.
Total revenues were $239.6 million, representing an increase of 28.3% on a year-over-year basis. The increase in total revenues was mainly attributable to an increase in revenues from our cloud computing and live streaming business. Revenues from cloud computing and other IVAS were $136.2 million, representing an increase of 52.7% on a year-over-year basis. The revenue of cloud computing business was $94.8 million, representing a 47.4% year-over-year increase. The increase in cloud computing and other IVAS revenues was mainly attributable to the increased sales of cloud computing services as a result of our expanded service capacities and increased demand from our customers. Revenues from subscription were $91.2 million, representing an increase of 8.2% on a year-over-year basis.
The increase is mainly due to the number of subscribers increased from $3.83 million in 2020 to $4.39 million in 2021. Revenues from online advertising were $12.3 million, representing a decrease of 7.1% on a year-over-year basis. The reduction was primarily due to lower advertising placements starting the second quarter of 2021 as a result of evolving regulations of the Chinese internet industry that negatively affect our advertising business. Cost of revenues was $118.6 million, representing 49.5% of our total revenues in 2021, as compared with $92.6 million and 49.6% of the total revenues in 2020. The increase was mainly due to increased sales of our cloud computing products and revenue sharing costs for our live streaming business.
Bandwidth costs, as included in cost of revenues, were $80.7 million, representing 33.7% of our total revenues, compared with $62.4 million or 33.4% of the total revenues in the previous year. The increase was mainly due to the increased sales of our cloud computing service. The remaining cost of revenues mainly consisted of costs related to revenue sharing costs for our live streaming products and depreciation of servers and other equipment. Gross profit for the year was $120.2 million, representing an increase of 28.2% on a year-over-year basis. Gross margin was 50.2%, same as the one in the previous year. The increase of gross profit was mainly due to increased revenue from cloud computing and live streaming business.
Research and development expenses for the year were $61.9 million, representing 25.8% of our total revenues, compared with $55.5 million or 29.7% of our total revenues in the previous year. The increase was primarily due to the increased employee-related cost. Sales and marketing expenses for the year were $24.6 million, representing 10.3% of our total revenues, compared with $18.1 million or 9.7% of our total revenues in the previous year. The increase was primarily due to increased marketing and promotional activities incurred for Mobile Xunlei and a new live streaming business during this year.
General and administrative expenses for the year were $36.9 million, representing 15.4% of our total revenues, compared with $33.9 million or 18.2% of our total revenues in the previous year. The increase was mainly due to increased amortization expenses regarding newly awarded restricted share units under the company's 2020 Share Incentive Plan. Impairment of assets, net of recoveries for the year was $1.2 million, comprising a one-time write-off of certain receivables and prepayments based on impairment assessment, compared with $5.1 million in the previous year. The decrease was largely due to a one-time write-off of certain receivables and prepayments in relation to our cloud computing business accrued in the previous year.
Operating loss was $4.3 million, compared with an operating loss of $18.8 million in the previous year. The decrease was mainly due to increased gross profit from cloud computing, subscription business and the live streaming business as discussed above. Net income was $1.1 million in 2021, compared with net loss of $14.1 million in the previous year. Non-GAAP net income was $7.3 million in 2021, compared with a loss of $11.8 million in the previous year. Diluted earnings per ADS in 2021 was $0.02 as compared with a loss of $0.21 in the previous year. Turning to our revenue guidance. For the first quarter of 2022, Xunlei estimates total revenues to be between $77 million and $80 million.
The midpoint of the range represents a quarter-over-quarter increase of approximately 10.4%. This estimate represents management's preliminary view as of the date of this release, which is subject to change, and any change could be material. Operator, we are now ready to take questions.
First question comes from George Tang with Private Investor. Your line is open.
Basically his question is, you know, management of the company, please, share with us Xunlei's future growth strategies and priorities of business development. Let me try to, you know, explain to you know. In the short term, you know, through our persistent efforts, we have made some progress narrowing our net loss to $500,000 in the fourth quarter of last year and achieving, you know, a net profit of $1.1 million for the full year of 2021. Furthermore, most of our business were improving and we are seeing continued momentum.
We will strive for greater improvement by increasing operating efficiency, optimizing ad expenses and exploring and focusing on areas of significant growth potential. Then in the long term, we will maintain Xunlei's competitive edge while seeking more long term and sustainable growth opportunities, as well as you know exploring more exciting products and services. Our strategic acquisitions and expansion of the live streaming business last year have shown initial and encouraging signs of progress, which contributed to a significant portion of total revenues in 2021. We expect that momentum of growth will continue. Thank you for your question.
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His question is we saw net loss in the fourth quarter declined significantly as compared with the third quarter. What is your profit forecast for the coming quarters? Thanks for the question. The significant reduction in net loss in the fourth quarter is the result of our rapid business growth and expense optimization. We usually do not provide guidance on net income or losses for the coming quarters. That being said, we are hopeful that we will improve both top line and bottom line in the coming quarters. By the way, in the fourth quarter earnings release, we provided a guidance of our anticipated total revenue for the first quarter of 2022, which is in the range of between $77 million and $80 million, which represents a sequential quarter-over-quarter increase of about 10%. Thanks for your question.
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Our next question from Sydney Song with Private Investor. Your line is open.
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His question is, Xunlei invest in a company called the Yingshi Innovation Technology Company and the company is applying for IPO and he wants to know the status of the IPO and also he wants to know the invest amount we made and what would be the expected rate of return on investments. We invested approximately RMB 60 million in Yingshi Innovation Technology Company Limited in around 2016. The company is also known as Insta360. Xunlei has about 8.73% equity ownership in the company. Insta360 has submitted application for IPO at the [Non-English content] or Science and Technology Innovation Board at the Shanghai Stock Exchange last year [Non-English content] RMB 60 million [Non-English content] Insta360 [Non-English content] 8.73% [Non-English content] Insta360 [Non-English content]
Thank you. To ask a question at this time, please press star, then one. Our next question comes from Billy Yan, private investor. Your line is open.
Hi hello.
Yeah hello yes.
Hi that was a great presentation, thank you. I have some questions about the Xunlei headquarters building. First of all, what's the total investment of this building so far? When do you expect to move in? Another question would be that, will Xunlei rent out some office space for rental income? That's it for my questions, and thank you.
So far we have spent approximately RMB 300 million and the total budget for the building is approximately RMB 450 million or about $70 million. The construction area of the building has about 65,000 sq m, and the building has 26 floors. We have completed the construction of the Xunlei headquarters buildings, and we anticipate to move in around June this year, if the impact of the COVID-19 won't last long.
People probably know, right now we are facing some challenges again, due to COVID-19. We expect the completion of the headquarters building will not only reduce our operating costs, but also generate some rental income. Because the building has not started operations, the rental income information is not available now. I'd like to say the building is mainly for self-use. Thank you for your question.
[Non-English content] I'm showing no further questions. I'd like to turn the call back to Eric Zhou for closing remarks.
Oh thank you again for your time and participation. If you have any questions, please visit our website at ir.xunlei.com or send us email to our Investor Relations. Have a good day. Operator we conclude this conference call. Thank you.
Thank you. This includes today's conference call. Thank you for participating. You may now disconnect.